linux-kernel - [PATCH 3/4] pvpanic: add access to pvpanic device information by using FDT

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Message-Id: <1540315537-70007-3-git-send-email-peng.hao2@zte.com.cn>
Date:   Wed, 24 Oct 2018 01:25:36 +0800
From:   Peng Hao <peng.hao2@....com.cn>
To:     robh+dt@...nel.org, mark.rutland@....com, arnd@...db.de,
        gregkh@...uxfoundation.org, andy@...radead.org,
        dvhart@...radead.org
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        hutao@...fujitsu.com, Peng Hao <peng.hao2@....com.cn>
Subject: [PATCH 3/4]  pvpanic: add access to pvpanic device information by using FDT

By default, when ACPI tables and FDT coexist for ARM64,
kernel takes precedence over FDT to get device information.
This patch increases the way to get information through FDT.

Signed-off-by: Peng Hao <peng.hao2@....com.cn>
---
 drivers/misc/pvpanic.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index bdcff8b..102a119 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -2,6 +2,7 @@
  *  pvpanic.c - pvpanic Device Support
  *
  *  Copyright (C) 2013 Fujitsu.
+ *  Copyright (C) 2018 ZTE.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -25,6 +26,10 @@
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/acpi.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <asm/virt.h>
+#include <linux/platform_device.h>
 
 MODULE_AUTHOR("Hu Tao <hutao@...fujitsu.com>");
 MODULE_DESCRIPTION("pvpanic device driver");
@@ -79,6 +84,37 @@
 	.priority = 1, /* let this called before broken drm_fb_helper */
 };
 
+static int pvpanic_mmio_probe(struct platform_device *pdev)
+{
+	struct resource *mem;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
+
+	if (!devm_request_mem_region(&pdev->dev, mem->start,
+				     resource_size(mem), pdev->name))
+		return -EBUSY;
+
+	base = devm_ioremap(&pdev->dev, mem->start,
+			   resource_size(mem));
+	if (base == NULL)
+		return -EFAULT;
+	atomic_notifier_chain_register(&panic_notifier_list,
+				      &pvpanic_panic_nb);
+
+	return 0;
+}
+
+static int pvpanic_mmio_remove(struct platform_device *pdev)
+{
+
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					&pvpanic_panic_nb);
+
+	return 0;
+}
+
 
 static acpi_status
 pvpanic_walk_resources(struct acpi_resource *res, void *context)
@@ -135,4 +171,35 @@ static int pvpanic_remove(struct acpi_device *device)
 	return 0;
 }
 
-module_acpi_driver(pvpanic_driver);
+static const struct of_device_id pvpanic_mmio_match[] = {
+	{ .compatible = "qemu,pvpanic-mmio", },
+	{},
+};
+
+static struct platform_driver pvpanic_mmio_driver = {
+	.driver = {
+		.name = "pvpanic-mmio",
+		.of_match_table = pvpanic_mmio_match,
+	},
+	.probe = pvpanic_mmio_probe,
+	.remove = pvpanic_mmio_remove,
+};
+
+static int __init pvpanic_mmio_init(void)
+{
+	if (acpi_disabled)
+		return platform_driver_register(&pvpanic_mmio_driver);
+	else
+		return acpi_bus_register_driver(&pvpanic_driver);
+}
+
+static void __exit pvpanic_mmio_exit(void)
+{
+	if (acpi_disabled)
+		platform_driver_unregister(&pvpanic_mmio_driver);
+	else
+		acpi_bus_unregister_driver(&pvpanic_driver);
+}
+
+module_init(pvpanic_mmio_init);
+module_exit(pvpanic_mmio_exit);
-- 
1.8.3.1